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Application of thermal spraying technology on aero-engine



[Abstract]: The key components of aero engines and aircraft-compressor blade tenon, casing, sealing grate, combustion chamber, turbine blades, guide blades, journals,



Thousands of parts such as rings and nozzles need to be thermally sprayed to prepare coatings. The application of thermal spray coatings has greatly improved the reliability and service life of aero engines.



Application of thermal spraying technology on aero-engine



Due to the wide source of thermal spraying materials, stable preparation process, strong design of coating composition structure, controllable coating quality, various functions and protective coatings can be prepared.



Chemical production has enabled thermal spraying technology to be applied in the field of aviation manufacturing technology. Key components of aero engines and aircraft-compressor blade tenon



Thousands of parts such as grate teeth, combustion chambers, turbine blades, guide blades, journals, bearing seats, sealing rings, nozzles, etc. need to be thermally sprayed to prepare coatings



The application is to greatly improve the reliability and service life of aero engines.



Application of thermal spraying technology on aero-engine



[Abstract]: The key components of aero engines and aircraft-compressor blade tenon, casing, sealing grate, combustion chamber, turbine blades, guide blades, journals,



Thousands of parts such as rings and nozzles need to be thermally sprayed to prepare coatings. The application of thermal spray coatings has greatly improved the reliability and service life of aero engines.



Application of thermal spraying technology on aero-engine



Due to the wide source of thermal spraying materials, stable preparation process, strong design of coating composition structure, controllable coating quality, various functions and protective coatings can be prepared.



Chemical production has enabled thermal spraying technology to be applied in the field of aviation manufacturing technology. Key components of aero engines and aircraft-compressor blade tenon



Thousands of parts such as grate teeth, combustion chambers, turbine blades, guide blades, journals, bearing seats, sealing rings, nozzles, etc. need to be thermally sprayed to prepare coatings








The application is to greatly improve the reliability and service life of aero engines.High temperature abradable sealing coating produced by plasma spraying technology
As one of the important coatings for engine components, the high-temperature abradable sealing coating is used to regulate the gap between the high-pressure turbine rotor component and the casing.
Efficiency is critical. The high-temperature abradable sealing coating with ceramic anti-friction self-lubricating material and polyphenylester developed in my country, and the coefficient of friction of the coating
Excellent performance, high temperature oxidation resistance and gas scouring performance are excellent at the same time. The thickness of the high temperature abradable seal coating is generally more than 1.5mm, and the machine must be used
Coating technology, computer closed-loop control of spraying parameters, and online monitoring of coating thickness, which is conducive to uniform coating structure and thickness, and stable coating metallurgy
Plasma spraying produces thermal barrier coating
Thermal barrier coatings are used in aero engines and ground gas turbines to protect high-temperature parts of the engine, such as combustion chambers, turbine blades, flame nozzles, etc.
Parts life, improve engine efficiency, reduce component temperature or increase gas temperature.
The preparation methods of thermal barrier coatings mainly include plasma spraying method and electron beam physical vapor deposition method. Thermal shock life and thermal conductivity of the thermal barrier coating
Mark. Without excellent thermal shock resistance, thermal barrier coatings cannot be successfully applied to aero engines with extremely high reliability requirements. Coating life
Ten thousand hours is the key to the successful application of thermal spray coatings to commercial aircraft engines.
Since the yttria stabilized zirconia works above 1200°C and undergoes a phase change during the subsequent cooling process, the volume of the material will expand by about 4% during the phase change process
Make the coating crack or even peel off. Scholars at home and abroad have conducted more research on the multiple systems of two or more rare earth oxides composite stabilized zirconia.
Significant progress. The working temperature of ternary rare earth composite stabilized zirconium oxide with gadolinium oxide, ytterbium oxide and yttrium oxide developed by American scientists can reach 1500℃, and has been commercialized.
The development trend of thermal spraying technology
After more than 100 years of development, thermal spray technology has become increasingly mature, and its applications involve aerospace, industrial gas turbines, automobiles, electricity, and fuel power.
Many fields such as medical and health, papermaking and printing.
In order to achieve a major breakthrough in the high thrust-to-weight ratio and high efficiency of aero engines, it is necessary to increase the temperature of the gas in the engine, which will inevitably cause the heat of the high-pressure turbine.
Significant increase in degree. Carbide, nitride ceramic SiC, Si3N4 are the most likely to replace nickel-based superalloys as the engine that works at higher temperatures
The important factor restricting its application is the insufficient stability of the material structure in the engine high-temperature gas environment, and the performance of carbide and nitride ceramics
The reaction produces volatile products, causing serious degradation of the structure and performance of ceramic materials. Using vapor deposition and plasma spraying composite technology on the ceramic surface
The layer can effectively prevent the contact between the high-temperature fuel gas atmosphere and the ceramic substrate, and improve the structural stability of the ceramic substrate.
In some important applications, high coating bonding strength is required, and even metallurgical bonding between the coating and the part matrix is ​​required. To overcome the thermal spray coating interface machine
So, the laser plasma composite spraying technology came into being. The interface of laser plasma composite spraying coating is metallurgical bonding, and the coating structure is dense and uniform, which can be used
Manufacturing of sealed runways. The main problems to be solved at present: One is to control the heat input to avoid excessive dilution of coating components and decomposition of material components; second,
No cracks in the coating

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